參數(shù)資料
型號： TPS55386PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 7 A DUAL SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO16
封裝： PLASTIC, HTSSOP-26
文件頁數(shù)： 9/45頁
文件大?。?/td> 1197K
代理商： TPS55386PWPR
Output Voltage Regulation
V
REF
V
OUT
- VREF
R2=R1
(2)
1
2
3
4
16
15
14
13
PVDD2
BOOT2
SW2
BP
PVDD1
BOOT1
SW1
GND
TPS5538x
5
6
7
12
11
10
SEQ
ILIM2
FB2
EN1
EN2
FB1
R1
OUTPUT1
R2
UDG-08041
8
9
COMP2
COMP1
Feedback Loop Compensation Component Selection
www.ti.com ......................................................................................................................................................................................... SLUS818 – SEPTEMBER 2008
Each output has a dedicated feedback loop comprised of a voltage setting divider, an error amplifier, a pulse
width modulator, and a switching MOSFET. The regulation output voltage is determined by a resistor divider
connecting the output node, the FBx pin, and GND (see Figure 21). Assuming the value of the upper voltage
setting divider is known, the value of the lower divider resistor for a desired output voltage is calculated by
where
V
REF is the internal 0.8-V reference voltage
Figure 21. Voltage Setting Divider Network for Channel 1
DESIGN HINT
There is a leakage current of up to 12
A out of the SW pin when a single output of
the TPS5538x is disabled. Keeping the series impedance of R1 + R2 less than 50 k
prevents the output from floating above the referece voltage while the controller output
is in the OFF state.
In the feedback signal path, the output voltage setting divider is followed by an internal gM-type error amplifier
with a typical transconductance of 315
S. An external series connected R-C circuit from the g
M amplifier output
(COMPx pin) to ground serves as the compensation network for the converter. The signal from the error amplifier
output is then buffered and combined with a slope compensation signal before it is mirrored to be referenced to
the SW node. Here, it is compared with the current feedback signal to create a pulse-width-modulated (PWM)
signal-fed to drive the upper MOSFET switch. A simplified equivalent circuit of the signal control path is depicted
NOTE:
Noise coupling from the SWx node to internal circuitry of BOOTx may impact narrow
pulse width operation, especially at load currents less than 1 A. See SW Node
Ringing for further information on reducing noise on the SWx node.
Copyright 2008, Texas Instruments Incorporated
17
Product Folder Link(s): TPS55383 TPS55386
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